Objective-C & Swift

Twitter Kit for iOS — Twitter Kit for iOS includes API wrappers, Tweet display, Log in with Twitter, and a Tweet composer view. Can be included in Swift apps.

Libraries built for the Twitter Platform

Inclusion in the list of libraries below is not an endorsement or recommendation of those organizations by Twitter. In addition, such inclusion is not intended to imply, directly or indirectly, that those organizations endorse or have any affiliation with Twitter.

Multi-platform

Temboo — by @temboo — Framework for working with Twitter via many platforms including iOS, Android, Java, PHP, Python, Ruby, and Node.js

Tweetinvimaintained by Linvi — a Twitter .Net C# API which has for mission to simplify the development of application for Twitter in C#. The streaming API has been used on research projects and collected around 3.2 million Tweets a day. The Twitter API has been created to be easy to implement new functionality and currently provide access to most of the functionalities. (documentation)

Crafted.Twitter by @martbrow — A caching compatible solution - with implementations for both ASP.Net Web Forms and MVC. Making it easy to include Tweets in your website.

Perl

PHP

140dev Twitter Frameworkby @140dev — The goal of this open source framework is to provide a greatly simplified interface to the Twitter Streaming API. The current version provides a tweet aggregation database, and a plugin for tweet display on any Web page. The framework is written in PHP and Javascript, and uses the MySQL database for storage. The Phirehose library is used for the connection to the Streaming API. The extensive documentation supplied with this library makes it an educational tool for anyone new to tweet aggregation and display on a website.

CodeIgniter-Twitter-Search-Libraryby @elliottlan — Search for certain tweets using keywords specified in a mysql database using the search api, streaming api or both at the same time. Written in php for codeigniter

freebird-phpmaintained by @corbanb — a app-only auth interface for PHP

PHP OAuth APImaintained by @manuellemos — This is a PHP class that can implements OAuth authorization and call APIs with OAuth tokens. It also supports two-legged auth. (documentation) (examples)

Twitter-API-PHPmaintained by @j7mbo — A very simple and actively maintained wrapper for the Twitter v1.1 REST API that utilises cURL for authenticated requests. Single file include, only a few methods to call - “as simple as you can get.” (examples)

twythonby @ryanmcgrath — Actively maintained, pure Python wrapper for the Twitter API. Supports both normal and streaming Twitter APIs. Supports all v1.1 endpoints, including dynamic functions so users can make use of endpoints not yet in the library. (docs)

TwitterAPIby @boxnumber03 — A REST and Streaming API wrapper that supports python 2.x and python 3.x, TwitterAPI also includes iterators for both API’s that are useful for processing streaming results as well as paged results.

Java

Javascript / node.js

Qt

o2by Akos Polster and Mandeep Sandhu — This library encapsulates the OAuth 1.0 and 2.0 client authentication flows, and the sending of authenticated HTTP requests. It supports OAuth 1.0 & 2.0. It also has some handy specializations for working with Facebook, Dropbox, Flickr, Skydrive and Google fusion tables.